The former senior constable, 31, has pleaded not guilty to murdering ex-partner Jesse Baird and Mr Baird's boyfriend Luke Davies on February 19, 2024.
CCTV footage played to a NSW Supreme Court jury depicts the former cop buying a number of items from Bunnings - including a shovel, gloves, a wheelbarrow and bin bags - before driving south and ditching two corpses at a farm in Bungonia on February 21.
Footage later captured Lamarre-Condon buying food and a drink from a McDonald's at the Sutton Forest truck stop, near Goulburn, while driving the hired van on February 22.
Cameras captured the driver of the van making an order and then placing his arm out the van's driver-side window to take a bag of food and a frappe.
The former police officer allegedly told a childhood friend who accompanied him on the first trip to Bungonia that he would have to return to the area and "be up all night" after he returned from his unsuccessful attempt to sink the bodies at Cella Farm.
Footage from the day before showed Lamarre-Condon attending Bunnings Rockdale in Sydney's south and buying numerous items across multiple transactions.
They included gloves, hazmat suits, bin bags, a tarpaulin, a wheelbarrow, quick-set concrete, a shovel and a power drill.
At one point, Lamarre-Condon can be seen climbing the shelving to access a tarpaulin.
The childhood friend, known by the pseudonym Elizabeth Kennedy, is captured alongside the former police officer in footage from another Bunnings in Goulburn, near Bungonia.
Ms Kennedy gave evidence on Wednesday, saying she unwillingly accompanied Lamarre-Condon to Bungonia and never knew the bodies were in the back of the van.
She said he then left her at the gate and drove into the property, where he stayed 30 to 40 minutes.
Lamarre-Condon's barrister John Stratton SC has accused Ms Kennedy of lying, saying she participated in the failed attempt to sink the bodies in a dam using quick-set concrete.
She denied those suggestions during cross-examination.
Further footage allegedly shows Lamarre-Condon can be seen buying dumbbells and a phone-charging cord from Kmart Sylvania, during the first trip to Bungonia.
Lamarre-Condon and Ms Kennedy were also captured filling up the van at a petrol station.
In her testimony, Ms Kennedy said Lamarre-Condon became "visibly annoyed" when she told him she could not fill the car with diesel because she had never driven a car before.
Lamarre-Condon told her he did not want to be seen on camera doing it, Ms Kennedy alleged.
The trial resumes on Friday.
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